In-situ leaching method of electric field strengthened fine grain tailings

Abstract

The invention relates to an in-situ leaching method of electric field strengthened fine grain tailings. The method comprises the following steps of: changing a fine grain tailings pond into an in-situ leaching system by embedding electrodes, drilling filling ports and pumping filling ports without destroying the original tailings pond structure, controlling the flowing direction and flowing speed of infiltration liquid through the strengthening function of the electric field to meet a standard of infiltration liquid, and extracting valuable metal in an extraction and electrodeposition plant. Through the strengthening function of the electric field, the flowing speed of the infiltration liquid and the migration speed of solute are accelerated, the problem that the fine grain tailings pile body is poor in permeability and low in leaching efficiency is solved, the fine grain tailings pile body meets the requirement of environmental protection by regulating the pH value of the infiltration liquid, the use ratio of the tailings resources is improved, the environmental influence is avoided, and the safety of the tailings pond is improved by electrifying continuously after leaching for electroosmosis strengthening. The in-situ leaching method is a novel efficient and environment-friendly tailings disposal technique, and has a great significance in alleviating the imbalance between the supply and demand of mineral resources in China.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of tailings resources, and relates to a method for leaching and mining fine-grained tailings, which is suitable for heap-free mining of fine-grained tailings secondary resources accumulated in tailings ponds. Background technique [0002] There are 12,718 tailings ponds in my country, of which 1,526 are under construction, accounting for 12% of the total, and 1,024 have been closed, accounting for 8% of the total. As of 2007, the total tailings accumulation in the country The volume is 8.046 billion tons. According to expert calculations, the recovery of valuable elements in existing tailings can recover 210 million tons of metallic iron, 300 tons of gold, 2 million tons of copper, and a large amount of metallic titanium and rare and rare earth metals, creating hundreds of billions of dollars each year. Yuan output value. If these tailings resources cannot be comprehensively recycled, it w...

AI Technical Summary

Problems solved by technology

If these tailings resources cannot be comprehensively recycled, it will cause huge waste

At present, the vast majority of tailings in my country have not been comprehensively utilized, and the comprehensive utilization rate is less than 10%. The utilization rate of non-ferrous metal tailings is even lower. Efficient and rational development and utilization of tailings resources will have important strategic significance for my country's economic development and national construction.

Stirring leaching method has a high leaching rate, but it has large investment, long process, high water consumption and energy consumption, high water content in tailings, and difficult solid-liquid separation. It is only used in concentrates and high-grade tailings

Therefore, based on the advantages and disadvantages of various leaching methods, based on the theory of electroosmosis, combined with the application of electric field in the fields of landfill anti-seepage, oil recovery technology and soil remediation, a method of electric field enhanced in-situ leaching of fine tailings is proposed. Solve the problems of poor permeability and low leaching efficiency of fine tailings

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